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There is an exercise in スピードマスターN4 to put verbs in the causative-passive form:

> つまらない話を（ **聞いて** ）、眠くなった。

The answer key says the correct form should be 聞かされて. While, for example,
[JLPT Sensei](https://jlptsensei.com/learn-japanese-
grammar/%E3%81%95%E3%81%9B%E3%82%89%E3%82%8C%E3%82%8B-saserareru-meaning-
causative-passive-form/) lists it as 聞かせられる which is literally passive form of
the causative 聞かせる.

Which form would be correct and why? When should one be preferred over the
other?


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question
conjugations passive-voice causation passive-form
Which form is the correct causative-passive 聞く?


Both are correct.

Godan verbs can take two causative forms as mentioned in
[Wikipedia](https://ja.wikipedia.org/wiki/%E4%BD%BF%E5%BD%B9)

> **「～せる」を「～す」と表すこともある** が、それは、五段活用のみであって、上一段活用・下一段活用・カ行変格活用・サ行変格活用では表さない。

Thus 聞かす・聞かせる are both legitimate causative forms of 聞く, and adding passive,
they become

  * 聞かす＋れる → 聞かされる
  * 聞かせる＋られる → 聞かせられる

(I'm not sure 聞かす is categorized as godan or
[サ変](https://ja.wikipedia.org/wiki/%E3%82%B5%E8%A1%8C%E5%A4%89%E6%A0%BC%E6%B4%BB%E7%94%A8)
but either way it takes れる. It conjugates:
聞かさ(ない)/聞かし(ます)/聞かす/聞かす(とき)/聞かせれ(ば)/聞かせろ.)

As for preference, my feeling is that there is none, but perhaps せられる is
harder to pronounce and used less frequently (by unconscious choice).

* * *

Similarly: 読まされる・読ませられる, 書かされる・書かせられる, 立たされる・立たせられる are all possible
causative-passive forms.


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answer